Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96052543aba0571…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 20:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cd11a509d6473c3c81b7b96a79c6c06 SHA-1: a3472e94372db65ad948c3b152ed216e408e8f7d SHA-256: b96052543aba0571cdfa8074439448da4926018681c072bff85c027555e01b99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many distinct hosts and disposable hosting providers, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous URLs pointing to potentially compromised or disposable domains supports the link farm and phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tourgardan.com/basefile/tourgardancom/files/jupajerirudidupage.pdf In PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/4967635071.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/41300454762.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614572750d3b2---pibasimu.pdfIn PDF document text
    • https://subarini.ro/mm/file/goxuvofuzokitedub.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/noworipemoreroreroxafe.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41dfd6cf1---wexonibezedotufa.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/kopuf.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/sezewurigewezoku.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/11934990172.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210904125734.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/30830387844.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461d1cc9155---boposazikisa.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/3826735701.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/6862450413.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/kixefalivubezinefaju.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/tamutikifawinuve.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/bajifovoginetaxana.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/94492590495.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/75488202708.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/wosidafupanemedesada.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/bapegesewuluxipitiv.pdfIn PDF document text
    • http://cascad-trans.ru/files/tabijoxobivugigade.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/12418220306.pdfIn PDF document text
    • http://bdnchem.com/upload/files/15397814567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+android+os+meanPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 10460 bytes
SHA-256: 89efa0d5c3670ec24a935bbb45ffbd2a62495cd38a89106d6a010b348158aac6
font_02_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 17700 bytes
SHA-256: 848ff7d5f715d404859989234197b0b13a4c171d633adb2f7c83f480b87366d0